Greg, I think they are very cool add-ons to your War Gum set. But if you decide you don't want em -- incomplete as they are -- I'll be happy to dispose of them for you!
I think I remember having read a post, once (by Kevin Saucier?) which indicated that cards like these can also be the result of someone having removed some of the print color runs. Dunno how you can selectively do that, though . . . Kevin?